Foldable vehicle

ABSTRACT

A foldable vehicle may include a chassis comprising a static support, a dynamic chassis frame that includes at least two substantially opposite frame parts and a folding mechanism for decreasing or increasing a distance between the at least two substantially opposite frame parts across a lateral axis of the vehicle between a folded state and an unfolded state; and a controller to control the folding mechanism.

FIELD OF THE INVENTION

The present invention relates to vehicles. More particularly, thepresent invention relates to a foldable vehicle.

BACKGROUND OF THE INVENTION

As the number of vehicles per a mile of road is growing each year due toan increase in demand, congestion and parking problems, especially inurban areas and big cities, where the population density is high,increases to. Public transport is an alternative to private vehicles,but it has its shortcomings, such as insufficient rural area coverage,availability, comfort and more. Other alternatives such as personalvehicles (e.g. mini cars or motorcycles) have a smaller footprint on theroad and in the parking but pose a risk in terms of safety. Thestability of a vehicle may correlate to the width of that vehicle, anarrower vehicle typically means a higher center of gravity, renderingthat vehicle more susceptible to driving conditions, especially inhigher velocities. Even though small vehicles are economical in terms ofcosts (e.g., price, gasoline and parking space), the risks associatedwith driving small vehicles might overcome the benefits.

Vehicles with adjustable width were introduced, offering comfort andsafety while in an expanded state, as well as easy parking on narrowavailable spaces.

A classic steering system typically turns the wheels at an angle byturning the wheel (e.g., with a wheel column) that is coupled to thewheel shaft. The wheel shaft is typically linked to the wheels (e.g.,usually the front wheels) via a steering rack. The steering systems ofvehicles with adjustable width may require redesigning to comply withthe changing distance between the wheels.

Vehicles with adjustable dimensions (e.g., width, height, or length) mayalso require a designated controller. The controller may need to beadapted to control the various elements involved in the width adjustmentof the vehicle. The controller may need to address various situationsand risks linked to the adjustment of the width of the vehicle.

It may be desired to provide a vehicle that is easily and efficientlyfoldable to allow parking in narrow parking spaces. It may also bedesired to provide a steering assembly that is adapted to narrow down orwiden up to comply with adjustable distance between the wheels. It mayalso be desired to provide a controller that is configured to control afoldable vehicle safely.

SUMMARY OF THE INVENTION

There is thus provided, in accordance with an embodiment of theinvention, a foldable vehicle that includes a chassis comprising astatic support, a dynamic chassis frame linked to the static supportthat includes at least two substantially opposite frame parts and afolding mechanism for decreasing or increasing a distance between the atleast two substantially opposite frame parts across a lateral axis ofthe vehicle between a folded state and an unfolded state; and acontroller to control the folding mechanism.

According to some embodiments of the invention, the folding mechanismincludes at least one carousel connected to at least one of the frameparts.

According to some embodiments of the invention, the at least onecarousel is connected to the static support and pivots about an axisorthogonal to the static support.

According to some embodiments of the invention, the at least onecarousel is positioned at a substantially equal distance from the twoframe parts.

According to some embodiments of the invention, the folding mechanismcomprises one or a plurality of pistons connected to the static support,the pistons are configured to drive the at least one carousel.

According to some embodiments of the invention, the frame parts retractto the static support in the folded state.

According to some embodiments of the invention, the chassis comprisesone or a plurality of tracks, the at least two frame parts slide alongthe tracks between the folded state and the unfolded state.

According to some embodiments of the invention, the foldable vehiclefurther comprises a locking mechanism to lock the at least twosubstantially opposite frame parts in a state that is selected from thegroup of states consisting of the unfolded state, the folded state andan intermediate state.

According to some embodiments of the invention, the foldable vehiclefurther comprises a split steering mechanism comprising a split steeringgearbox connectable to a steering wheel by a steering shaft; and twoshafts, a first shaft of the two shafts for linking the split steeringgearbox to a first front wheels of a vehicle, and a second shaft of thetwo shafts for linking the split steering gearbox to a second frontwheel of the vehicle; wherein the split steering gearbox is configuredto transmit and split rotation of the steering shaft to rotation of theshafts, so that the rotation of each of the shafts correlates to therotation of the steering shaft.

According to some embodiments of the invention, the split steeringmechanism comprises shafts that extend and retract with the decreasingor increasing of the distance between the two frame parts of thefoldable vehicle.

According to some embodiments of the invention, the split steeringmechanism is configured to keep a turn angle of front wheels of thefoldable vehicle during the decreasing or increasing of the distancebetween the two frame parts of the foldable vehicle.

According to some embodiments of the invention, the split steeringmechanism comprises shafts that extend and retract with the decreasingor increasing of a height of the foldable vehicle.

According to some embodiments of the invention, the split steeringmechanism is configured to keep a turn angle of front wheels of thefoldable vehicle during the decreasing or increasing of a height of thefoldable vehicle.

According to some embodiments of the invention, the foldable vehiclefurther comprises one or more sensors located on the vehicle for sensingparameters associated with assessing risk to the vehicle.

There is thus provided, in accordance with an embodiment of theinvention, a method for controlling folding and unfolding of a foldablevehicle using a controller, the method includes using the controller,receiving a folding or unfolding command; using the controller,obtaining sensed data from one or more sensors located on the vehiclefor sensing parameters associated with assessing risk to the vehicle;using the controller, assessing the risk; using the controller, checkingwhether the risk is below a threshold; using the controller, commencingthe folding or unfolding if the risk is below a threshold; and using thecontroller, checking whether the folding or unfolding is complete.

According to some embodiments of the invention, the method furtherincludes suspending the folding or unfolding of the foldable vehicle ifthe risk is not below a threshold.

According to some embodiments of the invention, the method furtherincludes, after suspending the folding or unfolding, obtaining senseddata from the one or more sensors, assessing the risk and checkingwhether the risk is below a threshold.

According to some embodiments of the invention, the method furtherincludes if the folding or unfolding is not complete, obtaining senseddata from the one or more sensors, assessing the risk and checkingwhether the risk is below a threshold until the folding or unfolding iscomplete.

According to some embodiments of the invention, the method furtherincludes suspending the folding or unfolding of the foldable vehicle ifthe risk is not below a threshold.

According to some embodiments of the invention, the method furtherincludes after suspending the folding or unfolding, obtaining senseddata from the one or more sensors, assessing the risk and checkingwhether the risk is below a threshold.

According to some embodiments of the invention, the method furtherincludes limiting speed of the foldable vehicle if the foldable vehicleis in the folded state.

According to some embodiments of the invention, the method furtherincludes, using the controller, autonomously generating a folding orunfolding command.

According to some embodiments of the invention, the method furtherincludes, using the controller, resolving conflicts between receivedcommands of folding or unfolding.

There is thus provided, in accordance with an embodiment of theinvention, a split steering mechanism that includes a split steeringgearbox connectable to a steering wheel by a steering shaft; and twoshafts, a first shaft of the two shafts for linking the split steeringgearbox to a first front wheels of a vehicle, and a second shaft of thetwo shafts for linking the split steering gearbox to a second frontwheel of the vehicle; wherein the split steering gearbox is configuredto transmit and split rotation of the steering shaft to rotation of theshafts, so that the rotation of each of the shafts correlates to therotation of the steering shaft.

According to some embodiments of the invention, wherein each of theshafts has a varying length.

According to some embodiments of the invention, the split steeringmechanism is configured to facilitate concurrent different lengths ofthe shafts.

According to some embodiments of the invention, the split steeringmechanism is configured to apply Ackerman correction when turning thefront wheels.

BRIEF DESCRIPTION OF THE DRAWINGS

In order for the present invention to be better understood and for itspractical applications to be appreciated, the following Figures areprovided and referenced hereafter. It should be noted that the Figuresare given as examples only and in no way limit the scope of theinvention. Like components are denoted by like reference numerals.

FIG. 1A is a top view of a chassis of a foldable vehicle in an unfoldedstate, in accordance with some embodiments of the present invention.

FIG. 1B is a top view of the chassis of the foldable vehicle shown inFIG. 1A, in a folded state.

FIG. 2 is a bottom view of a folding mechanism of the chassis of afoldable vehicle, shown in FIG. 1A.

FIG. 3 is a side view of a foldable vehicle with seats, showing someparts of the vehicle, in accordance with some embodiments of the presentinvention.

FIG. 4 is a frontal view of a split steering mechanism connected tofront wheels of a foldable vehicle, in accordance with some embodimentsof the present invention.

FIG. 5 is a side view of a chassis of a foldable vehicle with acontroller, in accordance with some embodiments of the presentinvention.

FIG. 6 is a flowchart of a method of controlling the folding andunfolding process of a foldable vehicle, in accordance with someembodiments of the present invention.

FIG. 7 is a bottom view of a split steering mechanism, in accordancewith some embodiments of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

In the following detailed description, numerous specific details are setforth in order to provide a thorough understanding of the invention.However, it will be understood by those of ordinary skill in the artthat the invention may be practiced without these specific details. Inother instances, well-known methods, procedures, components, modules,units and/or circuits have not been described in detail so as not toobscure the invention.

Although embodiments of the invention are not limited in this regard,discussions utilizing terms such as, for example, “processing,”“computing.” “calculating,” “determining.” “establishing”, “analyzing”,“checking”, or the like, may refer to operation(s) and/or process(es) ofa computer, a computing platform, a computing system, or otherelectronic computing device, that manipulates and/or transforms datarepresented as physical (e.g., electronic) quantities within thecomputer's registers and/or memories into other data similarlyrepresented as physical quantities within the computer's registersand/or memories or other information non-transitory storage medium(e.g., a memory) that may store instructions to perform operationsand/or processes. Although embodiments of the invention are not limitedin this regard, the terms “plurality” and “a plurality” as used hereinmay include, for example, “multiple” or “two or more”. The terms“plurality” or “a plurality” may be used throughout the specification todescribe two or more components, devices, elements, units, parameters,or the like. Unless explicitly stated, the method embodiments describedherein are not constrained to a particular order or sequence.Additionally, some of the described method embodiments or elementsthereof can occur or be performed simultaneously, at the same point intime, or concurrently. Unless otherwise indicated, the conjunction “or”as used herein is to be understood as inclusive (any or all of thestated options).

A foldable vehicle, according to some embodiments of the presentinvention, is introduced, which may include systems and mechanisms foradjusting the width of the foldable vehicle and for controlling suchadjustment. A foldable vehicle may refer to a vehicle with adjustablewidth or length, a vehicle with retractable and extendable elements, avehicle that is not constant in the dimensions thereof and the like,hereinafter foldable vehicle. A foldable vehicle, according to someembodiments of the invention, is configured to folds or unfold, therebydecreasing or increasing the lateral dimension of the vehicle(hereinafter—the width). According to some embodiments of the presentinvention, increasing or decreasing the width of the vehicle involvesdecreasing or increasing the distance between opposing wheels (alsoreferred to as left wheel and right wheel). The width of a foldablevehicle may be increased or decreased by increasing or decreasing thedistance between opposite parts of the vehicle. For example, a foldingmechanism of the foldable vehicle may increase or decrease the distancebetween two substantially opposite frame parts across a lateral axis ofthe vehicle between a folded state and an unfolded state. According tosome embodiments of the invention, increasing or decreasing the distancebetween opposite parts of the vehicle may increase or decrease thedistance between opposing wheels. Hereinafter decreasing the width ofthe vehicle is referred to as folding, and to increasing the width ofthe vehicle is referred to as unfolding.

In some embodiments of the present invention a foldable vehicle or afoldable vehicle may comprise a chassis. The chassis may comprise, astatic support, a dynamic chassis frame and a folding mechanism. Thedynamic chassis frame may include at least two substantially oppositeframe parts. The folding mechanism may decrease or increase a distancebetween the at least two substantially opposite frame parts across alateral axis of the vehicle between a folded state and an unfoldedstate.

A foldable vehicle according to some embodiments of the presentinvention may be useful in areas where parking space is scarce. Foldingthe vehicle may decrease the width, thus reducing width of the requiredparking space for the vehicle to park on. The foldable vehicle may alsobe easier to maneuver in a narrow road. When the width of a vehicle isdecreased, the center of mass of that vehicle is raised higher above theground, stability of the vehicle may be reduced. When in a folded state,a foldable vehicle, according to some embodiments of the presentinvention, may be driven at low speeds to avoid overturning. Forexample, in the folded state, a controller of the foldable vehicle maylimit the driving speed of the foldable vehicle. According to someembodiments of the present invention, the foldable vehicle may unfoldgradually during a drive, in order to maintain stability of the foldablevehicle (e.g., depending on parameters such as velocity, roadconditions, weight of the vehicle, turning radius, etc.).

Driving a foldable vehicle, according to some embodiments of the presentinvention, at speeds above a predetermined threshold speed may not berecommended, and in some embodiments the foldable vehicle may beconfigured to avoid speeding above such threshold speed limit, forexample, by having a controller of the vehicle prevent driving thevehicle at speeds above the threshold speed limit. When the foldablevehicle is in an unfolded state, the center of mass is lowered and as aresult the stability of the vehicle is increased. For example, afoldable vehicle may be in a folded state while parking for savingparking space or for parking at a limited parking space. When thefoldable vehicle exits the parking space and starts moving at a low tomedium velocities (e.g., velocities up to 40 kilometers per hour) thevehicle may still remain in the unfolded state. According to someembodiments of the present invention, the foldable vehicle may belimited to be driven at speeds below or up to a predetermined thresholdspeed (e.g., 40 Km/h).

According to some embodiments of the present invention, a folding orunfolding process of the foldable vehicle may be initiated by a user(e.g., the driver) of the foldable vehicle, or automatically in the caseof an autonomous foldable vehicle. In some embodiments the folding orunfolding process may be limited to commence and complete only when thevehicle is driving and is traveling at speeds below or up to apredetermined speed. The folding or unfolding process may be controlledby a controller of the foldable vehicle.

In some embodiments of the present invention, the foldable vehicle mayinclude a frame that defines a static support. The static support may bedesigned to support one or a plurality of seats, and may be a part(e.g., the floor) of a passenger cabin that includes a steering wheel,windshield, one or more walls, one or more windows, one or more doors, adashboard with various indicators, screens, and other components thatare typically part of a dashboard, as well as other components.

In some embodiments of the present invention, the static support may becoupled to a dynamic chassis, for example by connector. The dynamicchassis may include one or more moving frames, parts, structures orassemblies that facilitate the folding and unfolding of the foldablevehicle. In some embodiments of the present invention, the dynamicchassis may include two substantially opposite frame parts coupled tothe static support, wherein Each frame of the opposite frames mayinclude or support wheels. For example, the left frame may be linked(e.g., via a suspension) to the left side wheels (e.g., front left wheelback left wheel), whereas the right frame may be linked (e.g., via asuspension) to the right side wheels (e.g., right front wheel, rightback wheel). Wheels that are located on the same side (e.g., right orleft) of the vehicle are hereinafter referred to as following wheels. Insome embodiments of the present invention the dynamic chassis mayinclude a moving frame for each wheel of the foldable vehicle. Forexample, the dynamic chassis may include four movable frames eachsupporting a different wheel of the foldable vehicle. The dynamicchassis may include one moving frame, wherein a subset of the wheels maybe linked to the static support and the rest of the wheels may be linkedto the moving frame.

In some embodiments of the present invention, the foldable vehicle mayinclude one or a plurality of folding mechanisms for facilitating thefolding and unfolding of the vehicle. The folding mechanism may includeone or a plurality of actuators, drivers, motors, pistons, power trainsand driving mechanisms the like, hereinafter referred to as actuators. Afolding mechanism, according to some embodiments of the presentinvention, may be used to couple the static support to the dynamicchassis. The folding mechanism may be configured to apply force on thecomponents of the dynamic chassis so as to pull them closer together orpush them apart to a folded state or an unfolded state respectively oran intermediate state therebetween. The width of the vehicle may beincreased or decreased by operating the folding mechanism to increase ordecrease, respectively, the distance between the frame parts.

The folding mechanism may include tracks, rails, guides, transmissionelements, linear transmission elements and the like for transferring themoving parts of dynamic chassis to and between the folded state and theunfolded state. Tracks may be used to guide the moving parts along apredetermined path, and maintain the moving parts substantially paralleland opposite each other. The tracks may include sliding elements,bearings, linear bearings, magnets, lubricating materials and the like.Tracks may be provided on the static support and/or on the dynamicchassis.

The Dynamic chassis may include moving parts (e.g., substantiallyopposite frame parts) that fold into, above or below the static support.The dynamic chassis may fold or unfold with respect to the staticsupport along an axis of rotation of the wheels or an axis parallel tothe axis of rotation of the wheels.

In some embodiments of the present invention, the foldable vehicle mayfold or unfold without changing the overall height of the vehicle. Thefoldable vehicle may maintain the center of mass of the foldablevehicle, along a vertical axis substantially orthogonal to a planebetween front wheels and back wheels of the vehicle, during the foldingand unfolding of the foldable vehicle.

In some embodiments of the present invention, the foldable vehicle mayinclude one or a plurality of controllers (hereinafter, forbrevity—controller). The foldable vehicle may also include one or aplurality of sensors. For example, the foldable vehicle may includesensors that measure velocity, acceleration, location, temperature, thenumber and physical location of the passengers in the vehicle, theturning of the wheels, the turning of the steering wheel, distance ofthe vehicle from objects, the distance between a set of parallel wheels,the distance between the moving parts of the dynamic chassis, and othervehicle and/or travel parameters. The controller may be connected to thesensors, obtain sensed data from said sensors and process the obtainedsensed data.

The controller may be configured to control the folding mechanism. Thecontroller may be configured to receive an input to initiate folding orunfolding of the foldable vehicle. For example, a user of the vehicle,such as the driver may initiate a signal to be issued to the controllerto fold or unfold the vehicle. For example, the user may press a button,turn on a knob, press a virtual button on a touch screen, use a wirelesscommunication device such as a smartphone and employ another means ofuser interface to send a signal to the controller to fold or unfold thevehicle.

In some embodiments of the present invention, the foldable vehicle maybe autonomous and/or remotely controllable. The controller mayautomatically generate or may receive a signal to fold or unfold thevehicle from a user, or from a remote device, such as a computer, othercontroller, a third party device or other remote control device. Forexample, the controller may receive commands from the autonomousfoldable vehicle for folding and unfolding the autonomous foldablevehicle. In some embodiments of the present invention, the controllermay receive an unfolding signal (e.g., user initiated) and generate acommand signal to the folding mechanism to unfold the vehicle when andonly when the receiving sensed data indicating that the vehicle istraveling at a speed below a predetermined speed limit threshold (e.g.,40 Km/h), such as, between a first predetermined speed threshold and asecond predetermined speed threshold, which is higher than the firstspeed threshold and below or same as a predetermined speed limitthreshold (e.g., 40 Km/h). In some embodiments, the controller may limitthe speed of the foldable vehicle (e.g., by controlling the motor orother part/s of the propulsion system of the vehicle) to remain below orup to the predetermined speed limit threshold until the unfoldingprocess is completed.

In some embodiments of the present invention, the controller may receiveor generate a command to partially fold and unfold the foldable vehicle.The foldable vehicle may be configured to have a relation between thespeed of the foldable vehicle and the width of the vehicle (e.g., theextent of unfolding). The controller (or a control unit of theautonomous vehicle) may determine the extent of unfolding as a functionof speed of the foldable vehicle. During the folding, the controller maylimit the speed of the folding vehicle accordingly (e.g., limit thespeed of the foldable vehicle as a function of the width of thevehicle). During the folding or the unfolding, the controller may limitor suspend the folding or unfolding according to the speed of thefoldable vehicle.

In some embodiments of the present invention, the foldable vehicle maybe autonomous. The foldable vehicle may send signals to the controllerfor controlling the folding and unfolding of the vehicle. The foldablevehicle may receive signals from sensors and autonomously control thefoldable vehicle (e.g., control the speed, direction, folding andunfolding of the foldable vehicle).

Similarly, in some embodiments of the present invention, the controllermay receive a folding signal (e.g., user initiated) and generate acommand signal to the folding mechanism to fold the vehicle when andonly when the receiving sensed data indicating that the vehicle istraveling at a speed below a predetermined speed limit threshold (e.g.,40 Km/h), for example.

In some embodiments, the controller may limit the speed of the foldablevehicle (e.g., by controlling the motor or other part/s of thepropulsion system of the vehicle) to remain below or up to thepredetermined speed limit threshold until the folding process iscompleted.

In some embodiments of the present invention the controller may uselocation data (e.g., GPS). The foldable vehicle may use the locationdata for folding and unfolding the foldable vehicle. For example, thefoldable vehicle may detect a parking space in the vicinity of thefoldable vehicle, and fold in preparation for parking. The foldablevehicle may use the location data to detect that the foldable vehicle isgoing into a highway, and unfold in preparation for entering thehighway. The foldable vehicle may use location data for detecting areaswith narrow roads, as a result the foldable vehicle may fold (e.g., somenarrow roads may only allow vehicles with small width).

The controller may be configured to fold and unfold the moving parts ofthe dynamic chassis in a synchronic and stable manner. For example, thecontroller may operate the folding mechanism so as to move the twoopposing frame parts of the dynamic chassis concurrently and cause theseparts to move at the same velocity.

The foldable vehicle may be configured (e.g., by employing a designatedcontroller) to fold and unfold only while moving. The motion of theopposite frame parts during folding and unfolding is along an axis whichis substantially perpendicular to the general direction of travel of thevehicle.

For example, the vehicle may be designed to fold and unfold during themovement of the vehicle and within a range of allowed velocities (e.g.,between 5.38 Km/h and 40 Km/h). The range of allowed velocities may bepredetermined. The range of allowed velocities may be determinedaccording to regulation, safety, manufacturing, business reasons and thelike. The range of allowed velocities may be predetermined by amanufacturer of the vehicle and any other authorized body (e.g.,government body, regulation body, sales representative). The range ofallowed velocities may vary. For example, in some countries the range ofallowed velocities may be between 5.38 Km/h and 40 Km/h, in othercountries the range of allowed velocities may be between 0 (the vehiclemay remain unfolded at very low speeds) and 90 Km/h (the vehicle mayremain folded at high speeds). The range of allowed velocities may varyaccording to driving conditions such as turning radius and speed duringa turn. The foldable vehicle may be configured to prevent operation ofthe folding mechanism to folding or unfold the vehicle when the vehicleis stationary or traveling at very low speeds (e.g., below 5.38 Km/h).

The foldable vehicle may be configured to fold and unfold whiletraveling along a substantially straight path or when taking a turn(e.g., when the front wheels are turned at an angle sideways). Forexample, the front wheels may be turned at an angle so as to turn thevehicle to the left or to the right, the vehicle may fold or unfoldwhile the front wheels remain turned at an angle so that the vehicle maymaintain its accurate movement during the folding or unfolding.Maintaining the turn angle of the wheels regardless of the folding andunfolding may be applied as a safety measure for the vehicle. Forexample, when the vehicle is turning, the wheels are turned at an anglein a certain direction, if an unfolding is initiated (e.g., the vehicleis in a turn and the vehicle is accelerating towards high velocities sothe unfolding is automatically initiated) and the turn angle is notmaintained, the vehicle might change direction during the turn andcrash. The foldable vehicle may maintain the turning angle of thefoldable vehicle during the folding and unfolding of the foldablevehicle and during normal driving. The foldable vehicle may maintain theturning angle of the foldable vehicle if the folding and unfolding ofthe foldable vehicle was suspended. For example, if the foldable vehiclesuspended the folding of the foldable vehicle, so that the vehicle isbetween the folded and the unfolded state, the user may maintain controlover the steering of the foldable vehicle, and the turning angle of thefoldable vehicle may be maintained. In some embodiments of the presentinvention, during a turn while the foldable vehicle is folding orunfolding, the foldable vehicle may maintain the turn angle of thewheels (e.g., the steering radius) until a user of the vehicle (e.g.,driver) does any change (e.g., turns the steering wheel).

In some embodiments of the present invention, the foldable vehicle mayprevent acceleration or declaration during the folding and unfolding.Alternatively or additionally, the foldable vehicle may allowacceleration or declaration during the folding and unfolding. Forexample, the foldable vehicle may accelerate or decelerate during thefolding or unfolding within predetermined ranges of acceleration and/orvelocities. In some embodiments of the present invention, the user ofthe vehicle may maintain control on the velocity, acceleration anddeceleration (e.g., gas and brake pedals) of the foldable vehicle duringthe folding and unfolding of the folding of the foldable vehicle. Thefoldable vehicle may enable the use of the steering wheel to steer thefoldable vehicle during the folding and unfolding. In some embodimentsof the present invention, during the folding, the foldable vehicle mayenable the acceleration (e.g., increasing of speed), if for example, thespeed does not exceed a predetermined limit (e.g., according to thewidth of the vehicle at the moment).

In some embodiments of the present invention, the split steeringmechanism may adjust the front wheels for Ackerman correction, whichincludes adjustment of the turn angle of the front wheels when the caris turning. During a turn, to the left for example, the front left wheelmay travel a smaller distance than the front right wheel, Ackermancorrection will adjust the turn angle of the front wheels to account forthe difference in the traveled distance during a turn of the vehicle.The split steering mechanism may turn the front left wheel at an angleand the front right wheel in a different turn angle to adjust forAckerman correction. In some embodiments of the invention, the Ackermancorrection may be active also during folding and unfolding of thevehicle.

In some embodiments of the present invention, the split steeringmechanism may adjust according to a vehicle's width (e.g., folding andunfolding) and/or according to the vehicle's height (e.g., the height ofthe vehicle may be adjustable and/or changeable). The vehicle may adjustthe height of thereof, the split steering mechanism may keep the turnangle of the wheels in different heights of the vehicle. For example,the split steering mechanism may keep the turn angle of the wheelsbefore, during and after a height adjustment of the vehicle or any ofthe wheels. The split steering mechanism may keep the turn angle of thewheels, while tolerating differences in height between different sidesof the vehicle.

In some embodiments of the present invention, the split steeringmechanism may adjust the front wheels for Ackerman correction inrelation to the height of the vehicle and/or any of the wheels of thevehicle. For example, the split steering mechanism may adjust the frontwheels for Ackerman correction if the height of one side of the vehicleis different than another side of the vehicle. The split steeringmechanism may adjust the front wheels for Ackerman correction if theheight of at least one of the wheels (e.g., one of the front wheels) isdifferent than another wheel (e.g., one wheel is higher and all otherwheels are on the same height). For example, the split steeringmechanism may adjust the front wheels for Ackerman correction before,during and after a height adjustment of the vehicle or any of thewheels. The split steering mechanism adjust the front wheels forAckerman correction, while tolerating differences in height betweendifferent sides of the vehicle.

FIG. 1A is a top view of a chassis of a foldable vehicle in an unfoldedstate, in accordance with some embodiments of the present invention.Foldable vehicle 100 may include static support 20. Static support 20may be rectangular but can also be formed in another form. Staticsupport 20 may have a flat surface to provide for linear displacement ofpart or parts that are dynamically coupled to static support 20. Adriver seat may be mounted on static support 20. Additionally, passengerseat or seats may also be supported by static support 20.

Static support may also include a passenger cabin (not shown in thisfigure for brevity) that includes a steering wheel 50, windshield, oneor more walls, one or more windows, one or more doors, a dashboard withvarious indicators, screens, and other components that are typicallypart of a dashboard, as well as other components.

Static support 20 and other parts of foldable vehicle 100 may beassembled from multiple parts. For example, static support 20 may bewelded or assembled from a plurality of bars or rods made of metal,metal composite, carbon filer or composite material or other rigidmaterial. Static support 20 and other parts of foldable vehicle 100(e.g., frame part 22 a and frame part 22 b) may be manufactured fromlightweight material or materials to reduce the weight of the vehicle.For example, static frame 20 may be manufactured from aluminum toenhance weight to strength ratio.

A folding mechanism, according to some embodiments of the presentinvention, may include one or a plurality of actuators 30. Foldingmechanism 31 may include one or more actuators 30. In some embodimentsof the present invention, two actuators are provided, located at a frontend and at a back end of static support 20. Actuator 30 may be bolted,welded, assembled to, screwed to or mounted on or otherwise coupled tostatic support 20. In some embodiments of the invention one or aplurality of actuators may be coupled to frame parts 22 a and/or 22 b.The folding mechanism may be configured to facilitate the folding andunfolding of foldable vehicle 100. The folding mechanism may beconfigured to move frame parts 22 a and 22 b along a substantiallyparallel axis. In some embodiments of the present invention, theparallel axis may be substantially perpendicular to the generaldirection of travel of the vehicle. For example, the folding mechanismand actuator 30 may be parallel to an axis between the center of thefront wheels, so as to pull and push the front wheels along said axis,during the folding and unfolding of foldable vehicle 100.

Actuator 30 may include piston 32. Actuator 30 may drive piston 32 usinghydraulics, pneumatics, mechanical drivers, and/or electricalcomponents. Piston 32 may be extend and retracted. For example, piston32 may be extended fully or partially or retract fully or partially.Piston 32 may be connected to carousel 34 via pivot joint 36. Piston 32may be welded, assembled to or connect to carousel 34. The linear motionof piston 32 may cause carousel 34 to rotate about an axis of rotationclockwise or anti-clockwise.

Carousel 34 may connect to shafts 40 a and 40 b through pivot joints 38a and 38 b, respectively. Carousel 34 may connect to one or a pluralityof shafts. For example, carousel 34 may connect to one or a plurality ofmoving frame parts. Carousel 34 may apply a pulling or pushing force tothe movable frame parts via one or a plurality of shafts. Each ofcarousels 34 may be positioned along the central longitudinal axis ofstatic base 20 or at another location. For example, a first carousel 34may be positioned in the middle between the front wheels, and a secondcarousel 34 may be positioned in the middle between the back wheels.Each carousel 34 may apply symmetrical and opposite forces on theopposite frame parts 22 a and 22 b so as to reduce or increase thedistance between the frame parts. Carousels 34 may be positioned atdifferent locations between frame parts 22 a and 22 b. For example, afirst carousel 34 connected at a distal portion of static frame 20, maybe positioned closer to frame part 22 a, while a second carousel 34connected at a proximal portion of static frame 20, may be positionedcloser to frame part 22 b.

Shafts 40 a and 40 b may be connected to frame parts 22 a and 22 brespectively. Shafts 40 a and 40 b may be of similar or differentlengths. For example, if carousel 34 is centered between frame part 22 aand 22 b, shaft 40 a and shaft 40 b may connect at opposite locations onframe parts 22 a and 22 b respectively, wherein shafts 40 a and 40 mayhave similar lengths. For example, if both carousels 34 are placedcloser to frame part 22 a than to frame part 22 b, shafts 40 a and 40may have different lengths as a result. Shafts 40 a and 40 b may beextendable (e.g., telescopic poles, pistons, adjustable length shafts).Shafts 40 a and 40 b may vary in length in correlation to the intendedmaximal extent of the folded and unfolded states. Shafts 40 a and 40 bmay be used to limit the extent of the unfolding and folding of foldablevehicle 100. For example, the length of shafts 40 a and 40 b may limithow far apart frame parts 22 a and 22 b can be moved when unfolded. Ifshafts 40 a and 40 b are shorter, frame parts 22 a and 22 b may beallowed to travel a shorter distance between the folded and unfoldedstates. Is shafts 40 a and 40 b are longer, frame parts 22 a and 22 bmay be allowed to travel a longer distance between the folded andunfolded states.

Actuator 30 may extend piston 32, causing carousel 34 to rotate. Whenrotated in one direction, carousel 34 may push shafts 40 a and 40 bapart. When shafts 40 a and 40 b are pushed apart, the distance betweenframes 22 a and 22 b increases, resulting in unfolding of foldablevehicle 100. When rotated in a second direction opposite to the firstdirection, carousel 34 may pull shafts 40 a and 40 b closer. When shafts40 a and 40 b are pulled closer, the distance between frames 22 a and 22b decreases, resulting in folding of foldable vehicle 100.

Actuator 30 may have a locking mechanism for locking vehicle 100 in afully unfolded state, a fully folded state and any intermediate state.The folding mechanism may include one or more latches, stoppers, locks,switches, sensors, controllers, limiters and other elements for lockingor otherwise limiting the folding mechanism. For example, the foldingmechanism may have a stopper for preventing frame parts 22 a and 22 bfrom extending or retracting beyond a certain limit to avoid dismantlingof the frame parts.

According to some embodiments of the present invention, a foldingmechanism may include latches for locking frame parts 22 a and 22 b inthe folded state, in the unfolded state and in any intermediate statebetween the folded the unfolded states. According to some embodiments ofthe present invention, a folding mechanism may lock foldable vehicle 100in a fully unfolded state, a fully folded state and any intermediatestate electrically (e.g., by controlling how much pistons of the foldingmechanism extend and retract).

Vehicle 100 may be propelled by an electric motor, by an internalcombustion engine or by hybrid propulsion unit. Vehicle 00 may havefront wheels 10 a and 10 b and back wheels 10 c and 10 d. Vehicle 100may have a split steering mechanism. The Split steering mechanism mayinclude steering wheel 50. Steering wheel 50 may be coupled to steeringshaft 52. Steering shaft 52 may connect to steering assembly 54 (e.g.,power steering unit). Steering assembly 54 may include an electric motorand gears for assisting the driver in turning steering wheel 50.Steering assembly 54 and/or steering shaft 52 may be connected throughuniversal joint 56 to steering shaft 58. Steering shaft 58 may conveythe turning motion of steering wheel 50 onward to split steering gearbox62 through universal joint 60. Universal joint 65 may be connected tosteering box 66 with shafts 64. Shaft 64 may extend or retract with theunfolding or folding of the vehicle, respectively. Shaft 64 may maintainthe rotation status of the split steering mechanism and in turn the turnangle of the wheels during the unfolding or folding of vehicle 100.Steering box 66 connects to front wheels 10 a and 10 b through tie rod68.

First suspension 67 a and second suspension 67 b (shown in FIG. 4 ) mayconnect the wheels of the vehicle to the dynamic frames. Firstsuspension 67 a and second suspension 67 b may define an axissubstantially vertical to first suspension 67 a and second suspension 67b. Wheel 10 a (and other wheels) may pivot about the vertical axis(e.g., when the vehicle turns and the wheels turn angle). Tie rod 68 maymove relatively to frame 22 a for turning wheel 10 a at an angle, andfirst suspension 67 a (and second suspension 67 b) may remain staticrelatively to frame 22 a while wheel 10 a is turning at an angle.

FIG. 1B is a top view of the chassis of the foldable vehicle shown inFIG. 1A, in a folded state. Foldable vehicle 100 may fold when actuator30 causes piston 32 to retract. When piston 32 retracts carousel 34 isrotated so as to pull shafts 40 a and 40 b, and in turn frames 22 a and22 b get pulled closer together. Front wheels 10 a and 10 b may beturned at an angle and may maintain their turn angle during the foldingor unfolding of vehicle 100.

In some embodiments of the invention, foldable vehicle 100 may keep theturn angle of front wheels 10 a and 10 b while adjusting for Ackermancorrection of the relative turn angle between wheels 10 a and 10 b. Thesplit steering mechanism may be used in foldable vehicles and in smallvehicles. It may be difficult to implement a steering system in foldablevehicles and small vehicles (e.g., a steering system that adjusts thewheels for Ackerman correction). Typically, a steering system mightrequire space in the front of the vehicle. In small vehiclesimplementing a typical steering (e.g., with adjustment for Ackermancorrection) might be difficult due to design constraints (e.g.,placement of pedals and other elements in the front of the vehicle). TheSplit steering mechanism may adjust for Ackerman correction and vacatespace in the front of the vehicle (e.g., pedals).

FIG. 2 is a bottom view of a folding mechanism of a foldable vehicle, inaccordance with some embodiments of the present invention. Staticsupport 20 may include plate 24 extending laterally across staticsupport 20. Carousel 34 may be pivotally connected to static support 20on plate 24, so as to be capable of rotating in a place of rotation thatis substantially perpendicular to static support 34. Static support 34may have one, two or more folding assemblies, one folding assembly maybe positioned at a proximal end of static support 34 while the otherfolding assembly may be positioned at a distal end of static support 34for an efficient and uniform power distribution during the folding andunfolding of dynamic chassis frame part 22 a and 22 b. In someembodiments of the present invention the folding mechanism may includeone, two or more pairs of opposite folding assemblies for a smoothoperation to save power and evenly distribute momentum on frame part 22a and 22 b of the dynamic chassis.

The folding mechanism may include one or more rails 44 and a pluralityof sliding elements 46. Sliding elements 46 may connect to dynamicchassis frame part 22 a and 22 b so as to facilitate sliding of framepart 22 a and 22 b along rails 44.

FIG. 3 is a side view of a chassis of a foldable vehicle with seats, inaccordance with some embodiments of the present invention. Vehicle 100may have one or a plurality of front seats 98 and may have one or aplurality of back seats 99. Vehicle 100 may have a plurality seats in aplurality arrangements. For example. Vehicle 100 may have 3 rows ofseats with two chairs in each row. During the folding and unfolding ofvehicle 100 seat 98 may remain at a constant distance from steeringwheel 50. The steering wheel 50 may be rotated and remain at a desiredrotated position during the folding or unfolding of vehicle 100.

FIG. 4 is a frontal view of a split steering mechanism connected to thefront wheels of a foldable vehicle, in accordance with some embodimentsof the present invention. Steering wheel 50 may be connected to steeringshaft 52.

Steering assembly 54 and/or steering shaft 52 may be connected throughuniversal joint 56 to steering shaft 58 that transmits the turningmotion of steering wheel 50 onward to split steering gearbox 62 throughuniversal joint 60.

Split steering gearbox 62 may connect to each of two opposite shafts 64via universal joint 63. Each shaft 64 may connect to steering box 66 ofeither of the wheels via universal joint 65. Split steering gearbox 62may be configured to covert rotation of steering wheel 50 to wheels 10 aand 10 b through each of the two shafts 64. Shafts 64 may extend andretract with the unfolding and folding of the vehicle while facilitatingthe turning of wheels 10 a and 10 b at an angle when the vehicle is inthe folded or unfolded state, or in an intermediate state. Splitsteering gearbox 62 may be configured to convert the rotation ofsteering wheel 50 to wheels 10 a and 10 b while maintaining the Ackermanangle between wheels 10 a and 10 b. Suspension 69 may suspend wheel 10 a(and other wheels) to frame 22 a. In some embodiments of the presentinvention shafts 64 may not be extendable, the steering system may be asplit steering system. For example, shafts 64 may have constant length.Shafts 64 may have a constant length and adjust for Ackerman angleand/or keep a turn angle of the front wheels of the vehicle. Forexample, a split steering system may be useful in small, micro-cars withthe shafts having a constant length. The split steering system may allowspace for the feet of the driver and any other front passenger.

FIG. 6 is a flowchart of a method for folding and unfolding of afoldable vehicle, in accordance with some embodiments of the presentinvention. The method of the folding and unfolding may involve using acontroller. The controller may receive a folding or unfolding command602. For example, the controller may receive a command for folding orunfolding the vehicle from a user of the vehicle, such as the driver.Additionally, the controller may generate or receive a folding orunfolding command. For example, if the folding vehicle is autonomous,the controller may generate and/or receive a folding or unfoldingcommand autonomously. The folding or unfolding method includes obtainingsensed data 604 (e.g., measurements and signals) from one or moresensors (e.g. sensors located on the vehicle, and/or external sensors)for sensing parameters associated with assessing risk to the vehicle,both external to the vehicle and internal to the vehicle, that mayhinder the folding or unfolding process. For example, the controller mayobtain sensed data from one or more proximity sensors, so as to evaluatethe risk of colliding with a near obstacle, one or more accelerationsensors (e.g., gyro sensor) to identify risky maneuver or dangerousacceleration, one or more velocity sensors to identify dangerous speeds,one or more imaging sensors (e.g., camera, lidar) for obtaining an imageof a proximal vicinity of the vehicle and processing the image toidentify risks, one or more location sensors (e.g., GPS sensor) and anyother one or more sensors for measuring data regarding the extent offolding and unfolding and any associated potential risk. The controllermay obtain sensed data for assessing risk.

The controller may assess risk 606 related to the folding and unfolding.The risk may be assessed by assessing if the sensed data is withinpredetermined limits. For example, the controller may assess if thevelocity of the foldable vehicle is within a non-risky range (e.g.,between 5.38 Km/h and 40 Km/h). The controller may assess if the vehicleis making a sharp acceleration or deceleration. The controller mayassess if the foldable vehicle is in a location that is not safe forfolding or unfolding. The controller may assess a risk of accelerationrelated to folding and unfolding during a sharp turn.

To assess risk (e.g., combined risk), the controller may have a combinedrisk assessment where the controller may combine risk assessmentscategories. The controller may assess if in each risk assessmentcategory (e.g., velocity, acceleration, proximity to other vehicles) therisk is below a threshold. The controller may have a pass/fail criteriafor each risk assessment category. The controller may assess thecombined risk by checking if at least one of the risk assessmentcategories yields a risk above a threshold. The controller may assessrisk by assigning a risk index (e.g., value of assessed risk) for eachrisk assessments category. The controller may assess the combined riskby combining the risk indexes of the risk assessment categories.

The controller may receive a command for folding and unfolding thevehicle from another device (e.g., car computer, safety controller,autonomous control unit) or a remote device (e.g., a remote computer,cloud system, remote monitoring system, remote control system,autonomous driving remote control etc.). The controller may alsogenerate a folding or unfolding command in one or more certainsituations (e.g., an unfolding command when the speed of the vehicle isapproaching a predetermined speed limit threshold). According to someembodiments of the present invention, the controller may be configuredto resolve conflicts between conflicting commands. For example, if thecontroller receives a command from a user (e.g., the driver) to commencefolding of the vehicle, and at the same time the folding mechanism isexecuting an unfolding command the controller may be configured toresolve the conflict between the conflicting commands, according to aconflict resolution rule or set of rules. The controller may beconfigured to assess risk, priority, safety, car conditions, systemstate, car surroundings, road conditions, velocity, acceleration andother factors, and resolve conflicts between received and/or generatedcommands based on the assessed risk.

The controller may check if the risk is below a threshold 608. Forexample, the controller may check if the risk assessment categories arebelow a threshold. The controller may check if the combined riskassessment is below a threshold.

If the risk is below a threshold, the controller may commence folding orunfolding 610. The controller may be configured to give feedback touser/s of the vehicle and/or to other party (e.g., another computingsystem, a remote computer, autonomous controller) regarding variousaspects and steps. For example, the controller may be configured tocause an indication to be presented to the driver as to whether thevehicle is performing folding or unfolding. The controller may beconfigured to cause an indication to be presented to the driver or to athird party (e.g., device, software, cloud controller, server, etc.)that there is risk preventing the initiation of the folding or unfoldingprocess. The controller may be configured to cause an indication to bepresented to the driver that the folding or unfolding process has beensuspended. The controller may be configured to cause an indication to bepresented to the driver that the folding or unfolding process hascompleted. The controller may be configured to provide feedbackregarding the folding position of the vehicle. For example, thecontroller may cause an indication to be presented to the driverindicating that the vehicle is in the folded state, in the unfoldedstate or in an intermediate position between the folded state and theunfolded state.

If the risk is not below a threshold 608, the controller may suspend thefolding or unfolding 612. For example, the controller may delay, pause,cancel and ignore the received command for folding or unfolding 602.After the controller suspended the folding or unfolding 612, thecontroller may go back to steps 604-608 until the risk is below athreshold.

The controller may check if the folding or unfolding is complete 614. Ifthe folding or unfolding is not complete, the controller may go back toobtaining sensed data 604, assessing risk 606 and checking is the riskbelow a threshold 608 (repeating steps 604-608). For example, if duringthe folding and unfolding the risk is not below a threshold, thecontroller may suspend the folding or unfolding until the risk is belowa threshold. During the folding or unfolding, the controller may repeatobtaining sensed data 604, assessing risk 606 and checking is the riskbelow a threshold 608 until the folding or unfolding is compete. Forexample, if the risk is not below a threshold 608, the controller maysuspend the folding or unfolding 612 and repeat 604-608 until the riskis below a threshold. When the risk is below a threshold 608, thecontroller may commence the folding or unfolding 610, until the foldingor unfolding is complete.

If the folding or unfolding is complete 614, the controller may receivea new command 616 for folding or unfolding. When a new command isreceived, the controller may go to step 602 and continue to step 604 andso on.

The controller may receive a new command during the folding or unfolding(e.g., during step 610). The controller may be configured to resolveconflict between folding and unfolding commands. For example, during anyof steps 604-614 the controller may ignore or suspend any new commands,until the folding or unfolding are complete.

In some embodiments of the present invention, the foldable vehicle mayhave a locking mechanism, the controller may operate said lockingmechanism once the folding is complete, so as to lock the vehicle in thefolded state or the unfolded state. In some embodiments of the presentinvention the locking mechanism, may lock the vehicle in a positionbetween the folded state and the unfolded state (e.g., if the controllersuspended the folding or unfolding until the risk is below a threshold).

In some embodiments of the present invention, the folding and unfoldingmay be automated. For example, upon reaching a predetermined speed, thefoldable vehicle may automatically unfold. In some embodiments of thepresent invention, the foldable vehicle may be configured to suspend thefolding and unfolding of the foldable vehicle. For example, a sharp turnof the vehicle (e.g., the user of the vehicle turned the steering fast)may lead the foldable vehicle to suspend the folding and unfolding ofthe foldable vehicle. Additionally, upon excessive acceleration anddeceleration, the foldable vehicle may suspend the folding andunfolding. In some embodiments of the present invention, during a panicsteering (e.g., an unexpected maneuver) or during an emergency brake,the folding mechanism may stop the folding and unfolding of the foldablevehicle and lock the folding mechanism.

FIG. 5 shows a side view of a chassis of a foldable vehicle with acontroller, in accordance with some embodiments of the presentinvention. Foldable vehicle 100 may include controller 300. Controller300 may be configured to control the folding and unfolding of vehicle100. Foldable vehicle 100 may include one or a plurality of sensors.Controller 300 may connect to the sensors. Controller 300 may readmeasurements from the sensors.

Controller 300 may assess based on measurements form the sensors riskfactors associated with folding or unfolding vehicle 100. For example,controller 300 may read measurements from sensors for assessing ifanother vehicle is too close to foldable vehicle 100 so that if foldablevehicle 100 would unfold, foldable vehicle 100 might crash into thevehicle close to foldable vehicle 100, additionally, controller 300 mayread measurements from sensors regarding acceleration and determine thatvehicle 100 undergoing a turn at high acceleration which would be risky.

Controller 300 may decide based on the calculated risk factor whether tocommence the folding and unfolding of vehicle 100. For example, if therisk factor is high, controller 300 may prevent the folding or unfoldingfrom being initiated, additionally, if controller 300 detects a highrisk during the folding or unfolding of vehicle 100, controller 300 maysuspend the folding or unfolding in an intermediate position, controller300 may commence the folding or unfolding after the risk had subsided.

Controller 300 may assess based on measurements form the sensorslimitations associated with folding or unfolding of vehicle 100. Forexample, controller 300 may read the velocity of vehicle 100 and decideif to initiate unfolding (e.g., when the velocity is approaching 40 Km/hduring acceleration).

In some embodiments of the present invention, the controller may obtaindata regarding road conditions and the friction between the wheels andthe road. The controller may adjust an upper limit of velocity of thevehicle in the folded state. Obtained data regarding the road conditionsand the traction of the wheels may yield a risk assessment above athreshold. The controller may lower the limit of allowed vehiclevelocity (e.g., the vehicle may drive up to 30 Km/h instead of 40 Km/hin the folded state). The controller may adjust parameters of thefoldable vehicles according to the obtained data. For example, if theroad conditions are bad, the controller may adjust the parameters of thebrake pedals and acceleration pedals to account for the road conditions.In some embodiments of the present invention, the controller may changethe speed of the vehicle (or motor) and parameters of the brakes inorder to compensate for road conditions (e.g., if there's a differenttraction or friction coefficient difference between the left and theright wheels to the road).

In some embodiments of the present invention, the controller may have amanual mode and an automatic mode. In the manual mode, the controllermay receive commands from a user of the foldable vehicle to fold andunfold the foldable vehicle. For example, in the manual mode a user maypress a button for folding or unfolding the foldable vehicle. In theautomatic mode, the foldable vehicle may continuously collect andanalyze data from sensors, and generate automatically to fold or unfoldthe foldable vehicle.

FIG. 7 is a bottom view of a split steering mechanism, in accordancewith some embodiments of the present invention. The split steeringmechanism may include split steering gearbox 62. Split steering gearbox62 may be connectable to a steering wheel by steering shaft 58. Thesplit steering mechanism may include two shafts 64 connected to splitsteering gearbox 62. Split steering gearbox 62 may include a centralgear connected to steering shaft 58 and two peripheral gears connectedto the shafts 64. The central gear may transmit and split rotation ofthe central gear to rotation of the peripheral gears. The split steeringgearbox 62 may be configured to transmit and split rotation of steeringshaft 58 to rotation of the shafts 64, so that the rotation of each ofthe shafts 64 substantially correlates (e.g., is substantiallyidentical) to the rotation of the steering shaft 58. Shaft 64 mayconnect to steering box 66.

In some embodiments of the present invention steering box 66 may beconnected to a frame part of the vehicle (e.g., connected to one of twosubstantially opposite frame parts) via brackets 66 a. Steering boxes 66may move apart when the foldable vehicle unfolds. Steering boxes 66 maymove closer together when the foldable vehicle folds. Steering box 66may connect to lever 61 with first joint 61 a of lever 61. Steering box66 may include two gears, a first gear connected to shaft 64 and asecond gear connecting first joint 61 a of lever 61. Steering box 66 maytransmit rotation of shaft 64 (through the first gear and the secondgear) to lever 61 so that when the steering wheel is rotated, lever 61may rotate. For example, lever 61 may rotate in a direction opposite toa rotation direction of the steering wheel.

In some embodiments of the present invention lever 61 may connectsteering box 66 to tie rod 68 with second joint 61 b of lever 61. Whenlever 61 is rotated, tie rod 68 may turn a front wheel of the vehicle.For example, when the vehicle is in the folded state, steering box 66may remain static (e.g., connected to a frame part with protrudingelement 66 a), a rotation of steering shaft 58 may rotate steering box61 so as to move tie rod 68 (e.g., in accordance with Ackermanncorrection), tie rod 68 may change a turn angle of a front wheel of thevehicle.

Typically, vehicles where a steering rod is connected in front of anaxis between front wheels of the vehicle, the front wheels may be turnedat angles that do not comply with Ackerman correction (e.g., reverseAckerman). In some embodiments of the present invention, lever 61connecting tie rod 68, wherein tie rod 68 is connected in front of anaxis between front wheels of the vehicle, may apply Ackerman correction.Lever 61, tie rods 68 and the front wheels may be positioned along avirtual rectangle that conforms with Ackerman correction. Dimensions(and angles) of the virtual rectangle may conform with a length of lever61, a length of tie rod 68, a distance between front wheels of thevehicle and other dimensions of the vehicle, in order to apply Ackermancorrection.

In some embodiments of the present invention, a length of lever 61 andof tie rod 68 may be determined according to Ackerman correction. Lever61 may be extend from steering box 66 towards a proximal direction ofthe vehicle (e.g., front of the vehicle). Lever 61 may be positionedforward of an axis between front wheels of the vehicle (e.g., closertowards a front of the vehicle). The length of lever 61 may bedetermined according to the distance between front wheels of the vehicleand other dimensions of the vehicle (e.g., a length of the vehicle,distance of front wheels of the vehicle form a center of the vehicle,etc.). The length of lever 61 may be determined according to Ackermancorrection when the vehicle is in the folded state. The length of lever61 may be determined according to Ackerman correction when the vehicleis in the unfolded state. The length of lever 61 may be determinedaccording to Ackerman correction depending on any state between thefolded state and the unfolded state. For example, The length of lever 61may be determined according to a mathematical average of the distancebetween front wheels of the vehicle, in the folded state and theunfolded state.

In some embodiments of the present invention, a vehicle (e.g., a smallvehicle, micro vehicle) may have a split steering system. The splitsteering system may adjust the front wheels for Ackerman correction. Thesplit steering system may turn the front left wheel at a first turnangle and the front right wheel in a second, different turn angle toadjust for Ackerman correction. Typically, in small and micro vehicles,there's not much space for the feet of the driver. The split steeringsystem may provide precious space, e.g., space for the feet of thedriver and a front passenger.

In some embodiments of the present invention, the split steering systemmay adjust according to a vehicle's width (e.g., folding and unfolding)and/or according to the vehicle's height. The vehicle may adjust theheight of thereof, the split steering system may keep the turn angle ofthe wheels in different heights of the vehicle. For example, the splitsteering system may keep the turn angle of the wheels before, during andafter a height adjustment of the vehicle or any of the wheels. The splitsteering system may keep the turn angle of the wheels, while toleratingdifferences in height between different sides of the vehicle.

In some embodiments of the present invention, the split steering systemmay adjust the front wheels for Ackerman correction in relation to theheight of the vehicle and/or any of the wheels of the vehicle. Forexample, the split steering system may adjust the front wheels forAckerman correction if the height of one side of the vehicle isdifferent than another side of the vehicle. The split steering systemmay adjust the front wheels for Ackerman correction if the height of atleast one of the wheels (e.g., one of the front wheels) is differentthan another wheel (e.g., one wheel is higher and all other wheels areon the same height). For example, the split steering system may adjustthe front wheels for Ackerman correction before, during and after aheight adjustment of the vehicle or any of the wheels. The splitsteering system adjust the front wheels for Ackerman correction, whiletolerating differences in height between different sides of the vehicle.

In some embodiments of the present invention, a split steering mechanismmay include a split steering gearbox connectable to a steering wheel bya steering shaft, split steering mechanism may include two shafts, afirst shaft of the two shafts for linking the split steering gearbox toa first front wheels of a vehicle, and a second shaft of the two shaftsfor linking the split steering gearbox to a second front wheel of thevehicle. The split steering gearbox may be configured to transmit andsplit rotation of the steering shaft to rotation of the shafts, so thatthe rotation of each of the shafts correlates (e.g., is substantiallyidentical) to the rotation of the steering shaft. For example when theuser of the vehicle rotates the steering wheel, the rotational motion istransferred to the split steering gearbox, wherein the split steeringgearbox may be configured to transmit and split the rotation of thesteering shaft to rotation of the shafts.

In some embodiments of the present invention, the split steeringmechanism may be configured to facilitate a varying length of each ofthe shafts. For example, the shafts may be telescopic, the length of theshafts may vary according to a height of a wheel and/or a width of thevehicle. The split steering mechanism may change the turn angle of thewheels while facilitating varying lengths of each of the shafts.

In some embodiments of the present invention, the split steeringmechanism may be configured to facilitate concurrent different lengthsof the shafts. If one of more wheels of the vehicle are at a differentheight than the rest of the wheels (e.g., the vehicle is parked on acurb, a front wheel of the vehicle is elevated, the vehicle is ascendingan uneven ramp, etc.), a length of the first shaft may be different thanthe length of the second shaft. The split steering mechanism may beconfigured to facilitate different lengths of the shafts when one ofmore wheels of the vehicle are at a different height than the rest ofthe wheels. If a frame part of the vehicle extends at a different rateor to a different extent than the other frame part, a length of thefirst shaft may be different than the length of the second shaft. Thesplit steering mechanism may be configured to facilitate differentlengths of the shafts when the frame parts of the vehicle haveconcurrent different distances from a center of the vehicle.

In some embodiments of the present invention, the split steeringmechanism may be configured to apply Ackerman correction when turningthe front wheels.

In some embodiments of the present invention, a foldable vehicle mayinclude a split steering mechanism comprising a split steering gearboxconnectable to a steering wheel by a steering shaft. The split steeringmechanism may also include two shafts, a first shaft of the two shaftsfor linking the split steering gearbox to a first front wheels of avehicle, and a second shaft of the two shafts for linking the splitsteering gearbox to a second front wheel of the vehicle. The splitsteering gearbox may be configured to transmit and split rotation of thesteering shaft to rotation of the shafts, so that the rotation of eachof the shafts correlates (e.g., is substantially identical) to therotation of the steering shaft.

Different embodiments are disclosed herein. Features of certainembodiments may be combined with features of other embodiments. Thus,certain embodiments may be combinations of features of multipleembodiments. The foregoing description of the embodiments of theinvention has been presented for the purposes of illustration anddescription. It is not intended to be exhaustive or to limit theinvention to the precise form disclosed. It should be appreciated bypersons skilled in the art that many modifications, variations,substitutions, changes, and equivalents are possible in light of theabove teaching. It is, therefore, to be understood that the appendedclaims are intended to cover all such modifications and changes as fallwithin the true spirit of the invention.

While certain features of the invention have been illustrated anddescribed herein, many modifications, substitutions, changes, andequivalents will now occur to those of ordinary skill in the art. It is,therefore, to be understood that the appended claims are intended tocover all such modifications and changes as fall within the true spiritof the invention.

1. A foldable vehicle comprising: a chassis comprising a static support,a dynamic chassis frame linked to the statis support that includes atleast two substantially opposite frame parts and a folding mechanism fordecreasing or increasing a distance between the at least twosubstantially opposite frame parts across a lateral axis of the vehiclebetween a folded state and an unfolded state; and a controller tocontrol the folding mechanism.
 2. The foldable vehicle of claim 1,wherein the folding mechanism comprises a at least one carouselconnected to at least one of the frame parts.
 3. The foldable vehicle ofclaim 2, wherein the at least one carousel is connected to the staticsupport and pivots about an axis orthogonal to the static support. 4.The foldable vehicle of claim 2, wherein the at least one carousel ispositioned at a substantially equal distance from the two frame parts.5. The foldable vehicle of claim 2, wherein the folding mechanismcomprises one or a plurality of pistons connected to the static support,the pistons are configured to drive the at least one carousel.
 6. Thefoldable vehicle of claim 1, wherein the frame parts retract to thestatic support in the folded state.
 7. The foldable vehicle of claim 1,wherein the chassis comprises one or a plurality of tracks, the at leasttwo frame parts slide along the tracks between the folded state and theunfolded state.
 8. The foldable vehicle of claim 1, further comprising alocking mechanism to lock the at least two substantially opposite frameparts in a state that is selected from the group of states consisting ofthe unfolded state, the folded state and an intermediate state.
 9. Thefoldable vehicle of claim 1, further comprising a split steeringmechanism comprising a split steering gearbox connectable to a steeringwheel by a steering shaft; and two shafts, a first shaft of the twoshafts for linking the split steering gearbox to a first front wheels ofa vehicle, and a second shaft of the two shafts for linking the splitsteering gearbox to a second front wheel of the vehicle; wherein thesplit steering gearbox is configured to transmit and split rotation ofthe steering shaft to rotation of the shafts, so that the rotation ofeach of the shafts correlates to the rotation of the steering shaft. 10.The foldable vehicle of claim 9, wherein the split steering mechanismcomprises shafts that extend and retract with the decreasing orincreasing of the distance between the two frame parts of the foldablevehicle.
 11. The foldable vehicle of claim 9, wherein the split steeringmechanism is configured to keep a turn angle of front wheels of thefoldable vehicle during the decreasing or increasing of the distancebetween the two frame parts of the foldable vehicle.
 12. The foldablevehicle of claim 9, wherein the split steering mechanism comprisesshafts that extend and retract with the decreasing or increasing of aheight of the foldable vehicle.
 13. The foldable vehicle of claim 9,wherein the split steering mechanism is configured to keep a turn angleof front wheels of the foldable vehicle during the decreasing orincreasing of a height of the foldable vehicle.
 14. The foldable vehicleof claim 1, further comprising one or more sensors located on thevehicle for sensing parameters associated with assessing risk to thevehicle.
 15. A method for controlling folding and unfolding of afoldable vehicle using a controller, the method comprising: using thecontroller, receiving a folding or unfolding command; using thecontroller, obtaining sensed data from one or more sensors located onthe vehicle for sensing parameters associated with assessing risk to thevehicle; using the controller, assessing the risk; using the controller,checking whether the risk is below a threshold; using the controller,commencing the folding or unfolding if the risk is below a threshold;and using the controller, checking whether the folding or unfolding iscomplete.
 16. The method of claim 15, further comprising suspending thefolding or unfolding of the foldable vehicle if the risk is not below athreshold.
 17. The method of claim 16, further comprising, aftersuspending the folding or unfolding, obtaining sensed data from the oneor more sensors, assessing the risk and checking whether the risk isbelow a threshold.
 18. The method of claim 15, further comprising if thefolding or unfolding is not complete, obtaining sensed data from the oneor more sensors, assessing the risk and checking whether the risk isbelow a threshold until the folding or unfolding is complete.
 19. Themethod of claim 18, further comprising suspending the folding orunfolding of the foldable vehicle if the risk is not below a threshold.20. The method of claim 19, further comprising, after suspending thefolding or unfolding, obtaining sensed data from the one or moresensors, assessing the risk and checking whether the risk is below athreshold.
 21. The method of claim 15, further comprising limiting speedof the foldable vehicle if the foldable vehicle is in the folded state.22. The method of claim 15, further comprising, using the controller,autonomously generating a folding or unfolding command.
 23. The methodof claim 15, further comprising using the controller, resolvingconflicts between received commands of folding or unfolding.
 24. A splitsteering mechanism comprising: a split steering gearbox connectable to asteering wheel by a steering shaft; and two shafts, a first shaft of thetwo shafts for linking the split steering gearbox to a first frontwheels of a vehicle, and a second shaft of the two shafts for linkingthe split steering gearbox to a second front wheel of the vehicle;wherein the split steering gearbox is configured to transmit and splitrotation of the steering shaft to rotation of the shafts, so that therotation of each of the shafts correlates to the rotation of thesteering shaft.
 25. The split steering mechanism of claim 24, whereineach of the shafts has a varying length.
 26. The split steeringmechanism of claim 25, configured to facilitate concurrent differentlengths of the shafts.
 27. The split steering mechanism of claim 24,configured to apply Ackerman correction when turning the front wheels.